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run code in 150+ php & hhvm versions
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<?php $a = array('a', 4=> 'b', 'a' => 'b','c'); unset($a[4]); unset($a[5]); $a[4] = 'clement'; array_push($a, 'c'); var_dump($a);
based on kHevm
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(1) "a" ["a"]=> string(1) "b" [4]=> string(7) "clement" [6]=> string(1) "c" }
Output for hhvm-3.10.0

Process exited with code 153.